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<pre><span class="sourceLineNo">001</span>package org.slf4j.helpers;<a name="line.1"></a>
<span class="sourceLineNo">002</span><a name="line.2"></a>
<span class="sourceLineNo">003</span>import static org.junit.Assert.assertTrue;<a name="line.3"></a>
<span class="sourceLineNo">004</span>import static org.junit.Assert.fail;<a name="line.4"></a>
<span class="sourceLineNo">005</span><a name="line.5"></a>
<span class="sourceLineNo">006</span>import java.util.ArrayList;<a name="line.6"></a>
<span class="sourceLineNo">007</span>import java.util.Collections;<a name="line.7"></a>
<span class="sourceLineNo">008</span>import java.util.List;<a name="line.8"></a>
<span class="sourceLineNo">009</span>import java.util.Random;<a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.util.concurrent.BrokenBarrierException;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.util.concurrent.CyclicBarrier;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.concurrent.atomic.AtomicLong;<a name="line.12"></a>
<span class="sourceLineNo">013</span><a name="line.13"></a>
<span class="sourceLineNo">014</span>import org.junit.Test;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import org.slf4j.Logger;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.slf4j.LoggerAccessingThread;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import org.slf4j.LoggerFactory;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import org.slf4j.event.EventRecodingLogger;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>abstract public class MultithreadedInitializationTest {<a name="line.20"></a>
<span class="sourceLineNo">021</span>    final protected static int THREAD_COUNT = 4 + Runtime.getRuntime().availableProcessors() * 2;<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>    private final List&lt;Logger&gt; createdLoggers = Collections.synchronizedList(new ArrayList&lt;Logger&gt;());<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>    final private AtomicLong eventCount = new AtomicLong(0);<a name="line.25"></a>
<span class="sourceLineNo">026</span>    final private CyclicBarrier barrier = new CyclicBarrier(THREAD_COUNT + 1);<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>    int diff = new Random().nextInt(10000);<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>    @Test<a name="line.30"></a>
<span class="sourceLineNo">031</span>    public void multiThreadedInitialization() throws InterruptedException, BrokenBarrierException {<a name="line.31"></a>
<span class="sourceLineNo">032</span>        @SuppressWarnings("unused")<a name="line.32"></a>
<span class="sourceLineNo">033</span>        LoggerAccessingThread[] accessors = harness();<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span>        Logger logger = LoggerFactory.getLogger(getClass().getName());<a name="line.35"></a>
<span class="sourceLineNo">036</span>        logger.info("hello");<a name="line.36"></a>
<span class="sourceLineNo">037</span>        eventCount.getAndIncrement();<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span>        assertAllSubstLoggersAreFixed();<a name="line.39"></a>
<span class="sourceLineNo">040</span>        long recordedEventCount = getRecordedEventCount();<a name="line.40"></a>
<span class="sourceLineNo">041</span>        int LENIENCY_COUNT = 16;<a name="line.41"></a>
<span class="sourceLineNo">042</span><a name="line.42"></a>
<span class="sourceLineNo">043</span>        long expectedEventCount = eventCount.get() + extraLogEvents();<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span>        assertTrue(expectedEventCount + " &gt;= " + recordedEventCount, expectedEventCount &gt;= recordedEventCount);<a name="line.45"></a>
<span class="sourceLineNo">046</span>        assertTrue(expectedEventCount + " &lt; " + recordedEventCount + "+" + LENIENCY_COUNT, expectedEventCount &lt; recordedEventCount + LENIENCY_COUNT);<a name="line.46"></a>
<span class="sourceLineNo">047</span>    }<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>
<span class="sourceLineNo">049</span>    abstract protected long getRecordedEventCount();<a name="line.49"></a>
<span class="sourceLineNo">050</span><a name="line.50"></a>
<span class="sourceLineNo">051</span>    protected int extraLogEvents() {<a name="line.51"></a>
<span class="sourceLineNo">052</span>        return 0;<a name="line.52"></a>
<span class="sourceLineNo">053</span>    }<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
<span class="sourceLineNo">055</span>    private void assertAllSubstLoggersAreFixed() {<a name="line.55"></a>
<span class="sourceLineNo">056</span>        for (Logger logger : createdLoggers) {<a name="line.56"></a>
<span class="sourceLineNo">057</span>            if (logger instanceof SubstituteLogger) {<a name="line.57"></a>
<span class="sourceLineNo">058</span>                SubstituteLogger substLogger = (SubstituteLogger) logger;<a name="line.58"></a>
<span class="sourceLineNo">059</span>                if (substLogger.delegate() instanceof EventRecodingLogger)<a name="line.59"></a>
<span class="sourceLineNo">060</span>                    fail("substLogger " + substLogger.getName() + " has a delegate of type EventRecodingLogger");<a name="line.60"></a>
<span class="sourceLineNo">061</span>            }<a name="line.61"></a>
<span class="sourceLineNo">062</span>        }<a name="line.62"></a>
<span class="sourceLineNo">063</span>    }<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span>    private LoggerAccessingThread[] harness() throws InterruptedException, BrokenBarrierException {<a name="line.65"></a>
<span class="sourceLineNo">066</span>        LoggerAccessingThread[] threads = new LoggerAccessingThread[THREAD_COUNT];<a name="line.66"></a>
<span class="sourceLineNo">067</span>        for (int i = 0; i &lt; THREAD_COUNT; i++) {<a name="line.67"></a>
<span class="sourceLineNo">068</span>            threads[i] = new LoggerAccessingThread(barrier, createdLoggers, i, eventCount);<a name="line.68"></a>
<span class="sourceLineNo">069</span>            threads[i].start();<a name="line.69"></a>
<span class="sourceLineNo">070</span>        }<a name="line.70"></a>
<span class="sourceLineNo">071</span><a name="line.71"></a>
<span class="sourceLineNo">072</span>        // trigger barrier<a name="line.72"></a>
<span class="sourceLineNo">073</span>        barrier.await();<a name="line.73"></a>
<span class="sourceLineNo">074</span><a name="line.74"></a>
<span class="sourceLineNo">075</span>        for (int i = 0; i &lt; THREAD_COUNT; i++) {<a name="line.75"></a>
<span class="sourceLineNo">076</span>            threads[i].join();<a name="line.76"></a>
<span class="sourceLineNo">077</span>        }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>        return threads;<a name="line.79"></a>
<span class="sourceLineNo">080</span>    }<a name="line.80"></a>
<span class="sourceLineNo">081</span>}<a name="line.81"></a>




























































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